Unified Dark Matter models with fast transition (2009)
Piattella, Oliver F., Bertacca, Daniele, Bruni, Marco, Pietrobon, Davide
We investigate the general properties of Unified Dark Matter (UDM) fluid models where the pressure and the energy density are linked by a barotropic equation of state (EoS) $p=p(\rho)$ and the...
Non-Gaussianity in WMAP 5-year CMB map seen through Needlets (2009)
The cosmic microwave background radiation is supposed to be Gaussian and this hypothesis is in good agreement with the recent very accurate measurements. Nonetheless a tiny amount of non-Gaussianity...
Needlet Bispectrum Asymmetries in the WMAP 5-year Data (2009)
Pietrobon, Davide, Cabella, Paolo, Balbi, Amedeo, Crittenden, Robert, De Gasperis, Giancarlo, Vittorio, Nicola
We apply the needlet formalism to the Wilkinson Microwave Anisotropy Probe 5-year data, looking for evidence of non-Gaussianity in the bispectrum of the needlet amplitudes. We confirm earlier...
Observing the Evolution of the Universe (2009)
Aguirre, James, Amblard, Alexandre, Ashoorioon, Amjad, Baccigalupi, Carlo, Balbi, Amedeo, Bartlett, James, ...
How did the universe evolve? The fine angular scale (l>1000) temperature and polarization anisotropies in the CMB are a Rosetta stone for understanding the evolution of the universe. Through detailed...
Constraints on Primordial Non-Gaussianity from a Needlet Analysis of the WMAP-5 Data (2008)
Pietrobon, Davide, Cabella, Paolo, Balbi, Amedeo, De Gasperis, Giancarlo, Vittorio, Nicola
We look for a non-Gaussian signal in the WMAP 5-year temperature anisotropy maps by performing a needlet-based data analysis. We use the foreground-reduced maps obtained by the WMAP team through the...
Pietrobon, Davide, Amblard, Alexandre, Balbi, Amedeo, Cabella, Paolo, Cooray, Asantha, Marinucci, Domenico
We apply spherical needlets to the Wilkinson Microwave Anisotropy Probe 5-year cosmic microwave background (CMB) dataset, to search for imprints of non-isotropic features in the CMB sky. We use the...
Affine parameterization of the dark sector: costraints from WMAP5 and SDSS (2008)
Pietrobon, Davide, Balbi, Amedeo, Bruni, Marco, Quercellini, Claudia
We study a set of universe models where the dark sector is described by a perfect fluid with an affine equation of state $P=P_0+\alpha \rho$, focusing specifically on cosmological perturbations in a...
Late universe dynamics with scale-independent linear couplings in the dark sector (2008)
Quercellini, Claudia, Bruni, Marco, Balbi, Amedeo, Pietrobon, Davide
We explore the dynamics of cosmological models with two coupled dark components with energy densities $\rho_A$ and $\rho_B$. We assume that the coupling is of the form $Q=Hq(\rho_A,\rho_B)$, so that...
Dark Energy Constraints from Needlets Analysis of Wmap3 and NVSS Data (2006)
Pietrobon, Davide, Balbi, Amedeo, Marinucci, Domenico
We cross-correlate the new 3 year Wilkinson Microwave Anistropy Probe (WMAP3) cosmic microwave background (CMB) data with the NRAO VLA Sky Survey (NVSS) radio galaxy data, and find further evidence...
Pietrobon, Davide, Balbi, Amedeo, Marinucci, Domenico
We cross-correlate the new 3 year Wilkinson Microwave Anistropy Probe (WMAP) cosmic microwave background (CMB) data with the NRAO VLA Sky Survey (NVSS) radio galaxy data, and find further evidence of...